Oxidative polymerization of aniline on the surface of silica in the presence of poly(sulfonic acids) as a method of preparing efficient biosorbents

Polyaniline coatings on the surface of the macroporous silica have been prepared by oxidative polymerization via protonation of aniline by poly(sulfonic acids): poly(p,p′-(2,2′-disulfonic acid)diphenyle-neisophthalamide and poly(p,p′-(2,2′-disulfonic acid)diphenyleneterephthalamide. Two variants of modification have been studied: namely, the polymerization of aniline carried out in the presence of the preliminarily silaminated glass covered by poly(sulfonic acid) and the modification of silaminated glass by preformed complexes of poly(p,p′-(2,2′-disulfonic acid)diphenylenephthalamide-polyaniline. In both cases, the even polyaniline-containing polymer coating with a thickness of ∼3 nm is formed on the support surface. Sorbents containing the poly(p,p′-(2,2′-disulfonic acid)diphenylenephthalamide-polyaniline complex are efficient for isolation of DNA from mixtures of biopolymers.